Journal - Franklin Institute of the State of Pennsylvania (1826)
Franklin Institute, Philadelphia, Franklin Institute (Philadelphia, Pa.) · [Philadelphia : Franklin Institute] · leaf 487
n-tation was that of the heaviest impact, it is possible that two ormore impacts occurred on a single point with some cumulativeeffect. In some of the runs it is believed that this was the case. 478 A. W. GiBBS. [J. F. I. •There was also some question as to the interpretation of the im-pressions.… … ^e^L-^^^ Recording track as subsequently modified to register at each end of each tie. Fig. 7.
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